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Title: Thermo-Physical Properties of YSZ and Ni-YSZ as a Function of Temperature and Porosity.

Abstract

The thermal diffusivity, heat capacity, thermal conductivity, coefficient of thermal expansion adn elastic properties of Ni-YSZ and YSZ are reported in the temperature interval between 20C and 1000C. Specific heat capacity (Cp)and thermal diffusivity (a) were determined by differential scanning calorimetry (DSC) and by the laser flash method, respectively, while thermal conductivity was calculated from its relationship with Cp, a and the density of the material. The coefficients of thermal expansion (CTE) were determined using a thermomechanical analyzer (TMA), while elastic properties (Young's and shear modulus), were determined by resonant ultrasound spectroscopy (RUS). The effect of temperature and porosity on the thermo-physical properties of Ni-YSZ and YSZ is discussed.

Authors:
 [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
FE USDOE - Office of Fossil Energy (FE)
OSTI Identifier:
931627
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: The 30th International Conference & Exposition on Advanced Ceramics & Composites, Cocoa Beach, FL, USA, 20060122, 20060127
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; YTTRIUM OXIDES; STRONTIUM OXIDES; ZIRCONIUM OXIDES; NICKEL; SPECIFIC HEAT; THERMAL DIFFUSIVITY; THERMAL CONDUCTIVITY; THERMAL EXPANSION; YOUNG MODULUS; ELASTICITY; TEMPERATURE DEPENDENCE; POROSITY

Citation Formats

Radovic, Miladin, Lara-Curzio, Edgar, Trejo, Rosa M, and Porter, Wallace D. Thermo-Physical Properties of YSZ and Ni-YSZ as a Function of Temperature and Porosity.. United States: N. p., 2006. Web.
Radovic, Miladin, Lara-Curzio, Edgar, Trejo, Rosa M, & Porter, Wallace D. Thermo-Physical Properties of YSZ and Ni-YSZ as a Function of Temperature and Porosity.. United States.
Radovic, Miladin, Lara-Curzio, Edgar, Trejo, Rosa M, and Porter, Wallace D. Sun . "Thermo-Physical Properties of YSZ and Ni-YSZ as a Function of Temperature and Porosity.". United States. doi:.
@article{osti_931627,
title = {Thermo-Physical Properties of YSZ and Ni-YSZ as a Function of Temperature and Porosity.},
author = {Radovic, Miladin and Lara-Curzio, Edgar and Trejo, Rosa M and Porter, Wallace D},
abstractNote = {The thermal diffusivity, heat capacity, thermal conductivity, coefficient of thermal expansion adn elastic properties of Ni-YSZ and YSZ are reported in the temperature interval between 20C and 1000C. Specific heat capacity (Cp)and thermal diffusivity (a) were determined by differential scanning calorimetry (DSC) and by the laser flash method, respectively, while thermal conductivity was calculated from its relationship with Cp, a and the density of the material. The coefficients of thermal expansion (CTE) were determined using a thermomechanical analyzer (TMA), while elastic properties (Young's and shear modulus), were determined by resonant ultrasound spectroscopy (RUS). The effect of temperature and porosity on the thermo-physical properties of Ni-YSZ and YSZ is discussed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

Conference:
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  • In this paper we report on the fracture toughness of YSZ and Ni-YSZ and slow-crack growth behavior of Ni-YSZ at 20C and 800C. Results are presented for tests carried out in air for YSZ and in a gas mixture of 4%H2 and 96%Ar for Ni-YSZ containing various levels of porosity. The double-torsion test method was utilized to determine the fracture toughness from the peak load obtained during fast loading test specimens that had been precracked, while crack velocity versus stress intensity curves were obtained in the double torsion using hte load relaxation method. It was found that fracture toughness ofmore » these materials decreases with temperature and int he case of Ni-YSZ it also decreases with increasing porosity. The effect of temperature and microstructure, which was characterized by Scanning Electron Microscopy, on the fracture behavior of these materials, is discussed.« less
  • No abstract prepared.
  • The material most commonly used for the anode of the Solid Fuel Oxide Cell (SOFC) is a nickel/yttria stabilized zirconia (YSZ) cermet. The properties of the interface between Ni and YSZ can be influenced by the addition of reactive elements (Ti, Cr, Mn and Pd) to the Ni or the use of an interlayer consisting of the oxides of the reactive elements. Wettability experiments (1,500 C) showed the lowest contact angle ({Theta} = 103{degree}) for the system YSZ/TiO{sub 2}/Ni. The carbon activity in metallic melt causes reduction of the oxide at the interface, leading to improved wetting conditions. This interactionmore » is enhanced with increasing time and carbon activity. The reaction products were identified by EPMA and interpreted by thermodynamic considerations.« less
  • Many classes of rock such as sandstones, dolomites, chalks, and cracked igneous rocks have each a distinct characteristic porosity above which the material behaves as s suspension. The porosity at which this system changes, or transforms from isostress to solid load-bearing is defined here as the critical porosity {phi}{sub c}. It is easy to envision that at {phi}{sub c} not only the mechanical moduli, but also other properties such as strength and electrical conductivity, may also undergo transformations. Consequently, the critical porosity must be a fundamental property of a given porous system, not just of one of its physical properties.more » The observed values of {phi}{sub c} range from .005 for cracked granites to .30 or .40 for limestones, dolomites and sandstones, .60 for chalks and .90 for volcanic glasses. The data suggest that (1) A critical porosity value {phi}{sub c} exists which is typical of a given class of porous materials. Each class is defined on the basis of its common mineralogy or diagenetic porosity reduction processes. (2) Given {phi}{sub c} it may be possible to closely approximate the relation between porosity and velocity, over the entire range of porosity, with a modified mixture relation, in which the mixed components are the pure solid on one end, and a critical suspension on the other. (3) Without {phi}{sub c}, theory cannot yield reliable or useful velocity-porosity relations.« less